Safety gas-burner



(No Model.)

L. ZAGELMEYER.

SAFETY G-AS BURNER.

No. 332,770. Patented Dee. 22, 1885.

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LOUIS ZAGELMEYER, OF VEST BAY CITY, MICHIGAN.

SAFETY GAS-BURNER.

SPECIFICATION forming part of Letters Patent No.. 332,770, dated December 22, 1885.

Application filed February 26, 1885. Serial No. 157,065.

To @ZZ whom it may concern:

Be it known that I, LoUIs ZAGELMEYER, a citizen of the United States, and a resident of West Bay City, in the county of Bay and State of Michigan, have invented new and useful Improvements in Safety Gas-Burners; and I hereby declare that the following` is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to new and useful improvements in safety gas-burners, for automatically turning off the gas when the flame is improperly or accidentally extinguished. The escape of gas resulting from such causes is a fruitful source of accidents and disasters, and it is the object of my invention to construct a gas-burner provided with an automatically-operating device for turning off the gas whenever the gaslame is improperly extinguished.

My invention consists in the peculiar arrangement of a thermal bar composedrof two or more metal strips of unequal expansion, and coiled in the shape of a helix, in combination with a spring, a detent, and a trigger, all so arranged that the act of turning on the gas puts the spring under tension, and engages it with the detent, while the thermal helix, by its contraction, upon extinguishing the gas-flame,actuates the trigger, and setting the spring free again allows the latter to automatically turn oi the gas, all as hereinafter described.

In the drawings which accompany this specication, Figure 1 is a perspective View showing the safety devices of my burner ready to operate. Fig. 2 is a side view of my gasburner, showing the parts in the position when the gas is turned off. Fig. 3 is a crosssection on line x x in Fig. 2, showing the parts in the position when the gas is turned off. Fig. 4t is a similar cross-section showing the parts in position immediately after the gas is turned on. Fig. 5 is a vertical cross-section through the burner and its cock.

A is a section of gas-fixture, adapted to be screwed onto the gas service-pipe A', and is provided with the burner B and cock C,which are of the usual construction, and so arranged that the cock is in proximity to the burner.

(No model.)

D is a thermal helix-that is, a thermal bar formed ofstrips of metal of unequal expansion, soldered or otherwise secured together, and coiled into a iiat helix. metal of which this thermal helix is composed, are so arranged that an increment ofheat will expand the helix, while a loss of heat will contract it. The inner end of this thermal helix is secured to the gas-fixture below the burner, and near enough to the llame to be affected by the heat generated by the flame. The outer end, c, of thehelix is turned radially outward for a little distance.

E is a strong leaf-spring, secured at one end to a suitable arm or bracket, F, of the gas- The different strips of y fixture, and reaching with its free end in proximity to the cock.

G is a shorter spring, secured at one end to the gas-xture, in proximity to the free end of the leaf-spring E, and at right angles thereto. This spring has formed upon it an offset, b,which forms a detent for the free end of the leaf-spring E.

H is a lever pivotally secured at c to the gasXture. Its lower end terminates in a stirrup, I, into which the free end of the spring G is engaged.

J is a latch pivotally secured to the upper end ofthe lever H, and provided with a notch, d, adapted to engage upon the free end a of the helix. The free end of this latch is formed upon an inclined plane, e.

K is a stop secured to the gas-fixture, to arrest the free end of the leaf-spring E upon one side.

L is an arm secured to the cock, and bearing with its free end against one side of the leaf-spring nea-r its free end.

M is another arm secured to the cock, and reaching with its free end in proximity to the free end of the latch J.

In practice, when the gas is turned off, the parts are in the relative position shown in Figs. 2 and 3. Now, if the gas is turned on by means of the cock C, the arm M with its free end will strike against the inclined end e of the latch, and, lifting it up, will free its notch d from the end a of the helix and allow the lever-H to adjust itself from the position shown in Fig. 3 into the position shown in Fig. 4. This is owing to the tension of the roo spring G, which bears ,against the lower end of the stirrup I. Simultaneously with this movement the arm L, which bears against the leaf-spring E, carries the free end of that spring far enough to allow the offset b to act as a detent to arrest the retrograde movement yof said leaf-spring. This position of the leafspring, which is now under a strong tension, is shown in Figs. l and 4. If the gas is now lighted, the helix will soon expand under the influence of the heat from the ilame, and the free end a of the helix will soon travel beyond the notch d in lthe latch. which latter is held by its gravity in contact upon the end a of the helix. Now, if the gas-flame is improperly extinguished Without turning the gas off', the cooling of the helix will soon contract it, and the free end a, engaging in its retrograde movement the notch d of the latch, will oscillate the lever H into its former position, (Shown in Fig. 3.) This movement raises the free end of the spring G, and allows the leafspring E to escape from the offset b. As soon as the leaf-spring is free to follow its tension it will spring back into its original position, (shown in Figs. 1 and 2,) and, carrying the arm L with it at the same time, will turn the cock automatically into its closed position.

What I claim as my invention is- 1. In a safety gas-burner, for the purposes described, a thermal helix formed of a bar composed of two or more strips of metal of unequal expansion, coiled into a helix and secured in proximity to the gasburner, with its free end projecting, in combination with a trigger, a detent, and a spring actuated by the turning of the gas-cock for lighting the iiame, all arranged as shown, whereby the contraction of the thermal helix will operate the trigger and release the said spring, to automatically turn off the gas, substantially as described.

2. In a safety gas-burner, for the purpose described, the combination of athermal helix, a cock, arms upon the cock, a trigger set by the contact of said arms when the cock is operated to turn on the gas, a leaf-spring actuated by the same manipulation of the cock, and a detent for engaging the spring when wound up, all arranged as shown, whereby the contraction of the helix will operate the trigger to release the leaf-spring from its detent and close the cock automatically by its tension, substantially as described.

3. In a safety gas-burner, as described, the combinatiomwith the burner and cock, of the thermal helix D, having the free end a, the notched latch J, the lever H, terminating into the stirrup I, the spring G, having notch b, the leaf-spring E, the arms M L, and stop K, all arranged and combined as described.

LOUIS ZAGELMEYER.

Witnesses:

J. M. THOMSON, J oHN KOHLER. 

